MAX16840
LED Driver with Integrated MOSFET for MR16 and Other 12V AC Input Lamps
Unique Solution Allows MR16 LED Lamps to Be Compatible with Most Electronic Transformers and is Dimmable Flicker-Free
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Overview
Features and Benefits
- Cost-Effective Solution for MR16 and Other SSL Applications
- Proprietary Input Current-Control Scheme to Achieve Electronic Transformer Compatibility and Dimmability
- Buck, Boost, SEPIC, and Buck-Boost Topologies
- Analog Dimming
- Minimal Component Count Saves Cost and Space
- Integrated 0.2Ω (max) 48V Switching MOSFET
- Protection Features and Wide Operating Temperature Range Improves Reliability
- Thermal-Foldback Protection
- Output Overvoltage Protection
- Internal Overtemperature Protection
- Available in a 10-Pin Thermally Enhanced TDFN Package
- Operation Over -40°C to +125°C Temperature Range
Product Details
The MAX16840 is an LED driver IC for lighting applications. It includes all the necessary features to design low-component-count LED drivers for 12V AC and 24V AC input (e.g., MR16) light bulbs. A proprietary input-current control scheme allows LED lamps based on this device to be compatible with electronic transformers, and dimmable with standard trailing-edge dimmers (where electronic transformers are present).
The IC can be used in buck, boost, and buck-boost topologies and features. It has an integrated 0.2Ω (max), 48V switching MOSFET.
The IC uses constant-frequency average current-mode control. It senses the input current through the voltage at the FB pin, and regulates its average. An input pin (REFI) allows the setting of the input-current level. When the voltage at this pin is set below a certain threshold, the input current is proportional to this voltage, while when that voltage is beyond the threshold, the input current is set at a fixed, predefined level. This nonlinear behavior of REFI allows its use to achieve thermal foldback, by connecting it to an NTC resistor.
The IC also features an internal overvoltage protection on the IN pin to protect the internal switching MOSFET from damage if the LED string is open or if the voltage on the LED string is too high.
The IC has a separate EXT pin that can be used to guarantee that there is a kick-start of current at turn-on for low-input voltages for proper operation with electronic transformers. EXT drives an external npn transistor. Once the UVLO threshold of 5.5V is crossed on IN, EXT is pulled to ground and the external npn transistor is turned off.
The IC is available in a 3mm x 3mm, 10-pin TDFN power package, and is rated over the -40°C to +125°C operating temperature range.
Applications
- MR16 and Other 12V AC or DC Input LED Lighting Applications
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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MAX16840 Reliability Data1/12/2023PDF41K
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UG-6078: Maxim MR16 Evaluation Demo11/16/2015PDF128K
Tools & Simulations
Software Development
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.